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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b67b25b851caef3e68f4861901ffde2c9f02f7f9a01784e44167ea0d662f57' 
  AND token = 'nR4ycxuOTcSJvJXUI4p7/fFzW9IknfDpHITxUPg4KZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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