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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ce8249a798d60ad331d8ae27a8f683baab240008ec0fd41418f39beb3ee050' 
  AND token = '+IFtTz/hFzLeIjWEy5A2wxtWG5UiFAOIqZcHGizbAVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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