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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a3e62e91549f4b4d06ed55c0e3bd47b25f4291cb70d00ddaee0536e5a2c4ba' 
  AND token = 'VJOPheK7QYodr13kOYpFfD2suEIKcqJ6Kr0v3Ugj0wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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