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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe264e15622b569622704666cbf5d00f67ea2b4601b595d577c89709c67a31d' 
  AND token = 'itzVDLxp+C0LoDlY/br8NM6pQ9wNbV5APmHyy/iRU3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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