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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a0b00a5c094fd2681e752888ce34514b2f42f107a63130cf20d857e76bf86f' 
  AND token = 'I5wj1mh2beUgg12UrOT9NGI3eQttRutAC0YkAB0cWo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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