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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9030e496725edf4f26d7538ce57cd30e7465372e48a13e8c30ae7f6aca6572af' 
  AND token = 'Uytr+zUc6WEJCXS89RSx3f/upARGoynylm2GISBNY4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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