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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f08132cde4d83796c4eac76740c2a72dc93c3d0a55801908a9426a572cf31ca' 
  AND token = 's9DDmi2j85lIHCcyCdyJ+tveIX/LsCbOzqz/TSO4LTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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