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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f26bc82f145725d86f2d9c9c6da8b6214ed9c4fe1bd8109190fd3891b5229e' 
  AND token = 'MU/8H9/DpVa0aOGy6oehDo2pNHDv9emer8+2jJl+S5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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