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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee915eced4e3ea33858b7f275ec10daabf5439a236aeac904a39fc4d75bd32e' 
  AND token = '1aUGsqqiGLv4ALNo6ajR1ZQ/ks65CCqjzs4pfEO+GpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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