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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c6db3a4db98826b5d3e13d73fb04dc170c085ded6191c4f068760295610907' 
  AND token = 'rE5xjK9L772p1sBF8t/GD2q4I0nnHz/DHaa8DXF6ukU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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