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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b552ab4db0e6cf2b2aaaf9a7c4df838cff5340542452861ac2dd0acd9b5228c' 
  AND token = 't4pckfW37lM1S0oj4kv0X9LQ6qC3wULpHnIvpSiUmdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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