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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a3e7319741c7a7d930ab25dddb8a29f57fd7680dc6fee4bd51b2f00a3e1d35' 
  AND token = 'ic1Hvus45ixdM80LKG8aUi3913ty/FNPrbDIcKyxLuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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