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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c9fbba9cb90a835bbb4a67cb7a392797397ef48e988d714c0c88e6d4002680' 
  AND token = 'xbC37xXjm8gYLnwyr4PkFE16F6ph/vfjonQ+MHtWhbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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