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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26da5579393e707963402bfb9c8810f1fbde28d9b5cb2543424f02463e800fc7' 
  AND token = 'WW8dITOf0USPCbmXz/AwF+YBWJQWhsizZQ5f2xib34w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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