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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dbb4365037fb9afdfaff15ddcbc38a07d87f8c22ca8e50947f9fc4118be0c7' 
  AND token = 'n/6I48SQ3EYpFXqnl20GMGtJuGFF0MQCH68qjLrI2wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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