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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15e5fe4563957717fd5ee1f328446bc814e68f2a32157d0d59fc65d9afa73b3' 
  AND token = 'avakKE7psKYfirrfeFsKD/wxcwxvN3CUAoxut+GlFWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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