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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6edf6cf1e91512a3c8657aa3b4cf185db6b5bf1b980e731cdd9cf0f8b44db1' 
  AND token = '2OGH0MgfeYkSLSN3MjJRYopBEUkTivarRN7MmCV0YD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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