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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb1b944969abf9fa9d80294bfd6534ab83f9d3f6df4fc9e46efcf11c0bb9b17' 
  AND token = 'RaGYiaWuTZuebl7Ck4+l82RjOfd4mZK0hEQN57Gdn1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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