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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f2f5d5b5c7d657c6c819eef79e2b2ca88f2c6649b8b4505b74beb2923b659d' 
  AND token = 'DH4f4bz65dgsqhOfE1OAp1SMx4dqyv9KULd8yPpCsxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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