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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0433f088154dcf03a43ce014d7f4f01f0e6aad97f4f9942294eb4ede3076a9' 
  AND token = 'c1auQ5L4q/+4cnHaAiH3lBP/JyxrhyQrBW/0si33L+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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