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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34f9713f25a22f037f74120fa31d4b48adf75c729b842caca4775d2d99683e9' 
  AND token = 'vD/qeq9RVcicDkuK2XnPUQe6FLM+H9v7tvgquWamRmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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