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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b99b6206fbcfddd10569096e0204b09693e5b84251c77d6588978b86c56a3e1' 
  AND token = '6tC6BWAL7g996Gt7lop/JI30ZQ3n3b9XreSreHMbOYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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