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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca31e33166fc593ac065f0f1a836523e65806001dae8a9bb5fd9e392e34f434' 
  AND token = '0rHzdFbOle9+fS3/aXpz/gF40wG5GpC6DuMcpzXee9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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