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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaea83267ed629886d4ac0611398c683d3c26e03c789f1e7ff4e3e444b7994e' 
  AND token = 'gYqC7f4Er65skV7GepmDhRRvEUbxQAJkfDhESh9HzbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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