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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744b93dbaf5536cf8ef6fbb23e0ca788eb7da05ac99524c421e30a8269965676' 
  AND token = '0XWjMBZj8kJPMG/OOcEtcSVBdVbjCdoVGvsOsMk91IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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