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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7452be5c564e3cfc53d16aa2a2fa313a48817bc061bc70879299fc023fc163ae' 
  AND token = 'LoMCm1JzZ2nsFwaCbx3vsyMIn9enMa615YyNdEJY2+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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