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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3177ca846f6f50913ef90cf87291b031555b3e7a2462def19a8e640d5b41a1b1' 
  AND token = 'gcpm4xsI/tlNrJ3+5KHHJBIx7CpSS6itUcSj1orGDd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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