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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa94a0b630fa2a41314053f0b8b834600341a90eef18a6b96657c3ee5a59bbad' 
  AND token = 'iIXVcHpO9BuWENQChzft0l8X1Hzi6dyKeh0706+Qg7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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