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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c1c149f0292826c69eed2acbc7ba400c1916e3f1d45d034f2d7fb9f4d786e0' 
  AND token = 'eiAh1RfBjGiPdcaieBbcvX6bU6hAhQ837UuO7jrnmIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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