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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92212cb55a22bcc8420f2d0188d44fe83ac2b1e0ba5cbd5e8253e7797fd2d96d' 
  AND token = 'G4yxyAj+BpUr46sjn43vYcocA8bsBl51YuWxzIvJ5pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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