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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b330e9587115d752b0d8b6d037763ffc802cb916d8a885b5a75f55c600c3895' 
  AND token = 'fZLE+lhIPi+mn1Okw3u2a7VQgdzx2NyjDWH6AVqYWrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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