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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d65f799fad14dcfa5dbf35e7c9d211c761592a66ee173efc3f99aac3b85d0a' 
  AND token = 'sr2KfJGxAr0tIBLl8nlOFqS8fVmCDF3uflmKHPc7Lwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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