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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92893080e4aaddafc0cedb8bc9e7a3fab1df0fe92c3317290cf3fbb714b75a4' 
  AND token = 'ZswVfU+CoF5LxsmlbfR0JagJnY6U1e31uq8GQ2rlfNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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