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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e696445b80031aecd0e631a3b42eff2bcdd30fc53f8f808d9aa21be98d7803' 
  AND token = 'yM4opEXguIv4kEvIq1Ko3vnS6KGagnlMeYLFu6dfsw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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