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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b76a26d3f1eea128eebfd21bed2ff0d96c9298921fbfcfd00c8666b74681f4d' 
  AND token = '6OKN0uk+K7aX8KZGaN2jqIbLVSdJEpQ5hZU2FzxQdVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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