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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdcbdaf05f6aabe8ec6c8d69ce35f8c27f2ee4dd8fcbf754ce4a1009a8c1e97' 
  AND token = 'XYIF/sH3iT+roRjco1NU1XLvvfTETly93DYbalCY1RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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