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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ab705911bdb55b56ecb6b18becab31a8a1d897dc4a0c79121fa9e3b366986a' 
  AND token = '4OFJoYd6k+1+I9dr1RnmzTzjkiaCXEzbC8oczVlOdZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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