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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3eec0ef52eeafc4a364e305586a62bc411584d4dd9139d45fdca8865ffd725' 
  AND token = 'mvy+oLD1Tu9jnd3yyL55SDfOKz5iqUwNjK4iX3X7pMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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