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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18dca7fa0bebecf2b9c11be52fcf6734d190345348b62179fc0d60953d05bc63' 
  AND token = '2tVdBZMcC8n1yrsMoicRNO7SrsY+jxsb775o7lk+mXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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