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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd49a96ebffea57137c7ed75a051b7436ea14e5a80da34297803748301ce87d4' 
  AND token = 'HGXeC6qQIB3vNAfjeUUFvmx+rPNXydatpwWJsp9oZXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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