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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620c11b78159dd6e225714a3ae0f252e4a617ae699d088ab8f2ccaa6cf995480' 
  AND token = 'zTrG7x9ll6qLH6L7zkMJz6h4K3GQnoILFKx+Te+sN0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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