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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f216ee0ae9842348c604e4b78dfdde9a56ff1673c1d9f18ad79f234e0447c1c7' 
  AND token = 'rB+8zmwAP/3fCe46DsIfiUju3g8yiOlmdW1LHIljEKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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