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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b31b77064a8a1cc0bfa6203e1c0e41c182606cbcbc263d46ffbc210a7f6acb9' 
  AND token = 'xD8z/3AeTWNehIN/hzaLFQ+uud4FAZHCdGHT4FlEZFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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