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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6347952ad41df128f1b8aa1e4a31ca48f289d8ad14ab2f1d71a02882d65d2a' 
  AND token = 'cxQAlpujsZKeffIXHwBCnSHGi3mgF8jiZh3aykNa4QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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