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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad0ad64fc471fbc757488cfb457266d508ce62081b0760796b749fd657861cf' 
  AND token = 'J7MkK2gcqN9mzJV7pU+j6OWupm0+B76WI9WYeNd7t6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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