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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd1e281f40cb708528c5ac8246c929dc893ac68528aab9e4e4ac85557be8044' 
  AND token = '2D27VD1ymTKkS6LKV6Hvv2m/zFqSGvkXQy9KoW96dFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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