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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd2c889fd67d66edd902310de9e9ac73b1e1b795401795b1f68f991aa749385' 
  AND token = 'LcQQnONl3nExbolWwikSlgcUDxiTCG0N/RdlPfw4JOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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