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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce6456e4d57994748741614904a8b3cf718daf40f8f206945bc81e6ff66fb5e' 
  AND token = 'kKTq/GNZUPiua9q6ToQz8tEsfr8SPNv42RR9w30WFyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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