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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583c9fdf0f4989818739dc4ac239a9f4dda81dea63cd90d190ae47b516271270' 
  AND token = 'cjFxXciWsfl4rVljJ2Avo5sCXivmSn9k6ZF8YW7Ulas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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