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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fee600bd4535a3ab5c169c303c85e7d07781233a717e8cdc42ff0bafbacdb4c' 
  AND token = 'hi/Mr1TQdClXJJeBap1H0ESd1T8FKuSTt4JMOJ5W2Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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