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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecccf34e09c2f3623a2f67095743ad1224f576e7d713bd95f8ad51933239c76e' 
  AND token = 'jArLeijGjPluTQ2taku736x3gYrjA2z+G3sQm1xDUPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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