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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3698f427865210416fd78dd0cfd85f4ed31ac7cecfe3908b5ac5579184789705' 
  AND token = 'Uhg0k7hrrWLQre311/GxGIx1txY37/vTo7odVUz1v1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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