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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45ba8c12cf11eea6c1991dbcf4e601defd1935d9cee59f9d3ec55c0a81c6c0d' 
  AND token = 'bNTt+XulNw8h7D+oXVDpp2mXWW/qAwAxhJ2wckplewQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}