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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a245f0f2ce7276b88b63a30a2522884a5f428b61c28162cea714f2ac46270e4b' 
  AND token = 'e+BbOFmvW+O/JeWqqv6ClerT6sbLcsHsseK/NCseUtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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