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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05664ef49f5637dc588674ab4d94e512ac7f88e278e8a02c10f133a73ebb5354' 
  AND token = 'vWCO3oo3qxsSjZJt1cU5ObJGXrxOIPG1Q1Ki5Z6ArIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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