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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf63fe2553b42e769bc5bddb7bdbd1d8ae3229423fda13c7ad69d01ba95058a3' 
  AND token = '6i5iMOXQNu5IGyzW7mxx01QPZ/tZYaqvcOVpJMpPSXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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