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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e433f142c2f1a5e157f98eba4b7b5de1bdf9248d507a69f4fc62031a19381de' 
  AND token = '04mWhqrVHqmvWfFrMfKHE15aqkd7ak5SJ5dehFgyq5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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