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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe361342709cdabb7e316d7de0294d8f61b39d385c750a83db9ee91eeac58d8a' 
  AND token = 'X6gItVEjRNRRQPpohoH2FtRlfO1PgqDWajHD053lgts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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