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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9012337b5a12fd7ec6d0dc13088dd5af2682d139f04b51ee557de138bb867e3e' 
  AND token = '+8ws2336gU7wjtoLul/T9MLteLwZrSiyAqg05+Mz0vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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