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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb88f0b37fce56804a0dc7206f54113592fbaf08a2ec785e6599b172cf6f336f' 
  AND token = '3nINRmWF9OWMRqFhl+Dn+7v7Lyzhasu+SOGBtPl8f1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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