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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adefac64703ef7fb604d8c3f9514e89d1c4072afa958bc16e367ac36f87253a3' 
  AND token = 'BZRXQUfBaqg/DSsgo2h+gkDvWvb53XQfJIlB708gIr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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