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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95c78d84d595239d2b157534f4060c8d80e3b07758ed17a2323034e9542b703' 
  AND token = '0JqtK/FwbX6/NLGogH7czxIjKIcen30vr7VAuV2MehY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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