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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a91c7d79be4cece25f1f7735c4bb7ef5a684d148230281b2d2e2378fea1be68' 
  AND token = 'Su9ST7tULtECbp/3KQzn2FW22CvgLz61owdiz8bBzHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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